The gettimeofday() function will fail for 32-bit interfaces if: EOVERFLOW. The system time has progressed beyond 2038, thus the size of the tv_sec member of the timeval structure pointed to by tp is insufficient to hold the current time in seconds. Usage. If the tv_usec member of tp is > 500000, settimeofday() rounds the seconds upward.
gettimeofday.c - Apple Inc. /* * Copyright (c) 2003-2005 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Problem with gettimeofday() - C Board Oct 15, 2013 C For Dummies Blog
Mac OS X Manual Page For gettimeofday(2)
Time and Timing! C Tutorial 23 - YouTube Jan 25, 2015 C++ (Cpp) gettimeofday Examples - HotExamples
Example of timing using gettimeofday. GitHub Gist: instantly share code, notes, and snippets.
clock() or gettimeofday() or ippGetCpuClocks()? gettimeofday(): It returns time in milliseconds or the wall clock time. The precision of gettimeofday is also very bad, for example, for a 3 GHz machine that means precision == 3 million of cpu clocks only. If your application does only calculations, clock() and gettimeofday() would be fairly close.